The effect of laser scanning path on microstructures and mechanical properties of laser solid formed nickel-base superalloy Inconel 718

Liu, Fencheng; Lin, Xin; Huang, Chunping; Song, Ming; Yang, Guiling; Chen, Jing; Huang, Weidong

doi:10.1016/j.jallcom.2010.11.176

Cited by 237 publications

(80 citation statements)

References 11 publications

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“…Considering the high cost of replacing defected or damaged parts with new ones, it is more significant and appealing to repair these parts quickly and economically [3]. Laser forming repairing (LFR), as a kind of metal additive manufacturing technology, can be utilized to recover complex shaped damaged parts up to certain depth, without affecting the inherent mechanical properties of the body [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Research on the Grain Boundary Liquation Mechanism in Heat Affected Zones of Laser Forming Repaired K465 Nickel-Based Superalloy

Lin

Wang

et al. 2016

Metals

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Abstract:The damaged K465 nickel-based superalloy parts were repaired by laser forming repair technology. The cracking characteristics and grain boundary liquation in heat affected zones were investigated by optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). It was found that the cracks originated from the heat-affected zone and extended to the repaired zone. The calculation by Thermol-Cale software showed that the larger γ 1 particles at grain boundaries partly dissolved in the γ phase, which made the solutes' concentration at the γ 1 /γ interface meet the eutectic-type liquation reaction condition of γ + γ 1 Ñ L. Then, grain boundaries liquation occurred and liquid films appeared with the temperature increasing in a rapid heating process. However, the intragranular γ 1 phase completely dissolved into the γ phase with no devotion to the liquid film. The dissolution of M 5 B 3 borides at grain boundaries could promote grain boundary liquation.

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Section: Introductionmentioning

confidence: 99%

Research on the Grain Boundary Liquation Mechanism in Heat Affected Zones of Laser Forming Repaired K465 Nickel-Based Superalloy

Lin

Wang

et al. 2016

Metals

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“…These elements include: aluminum, boron, carbon, chromium, cobalt, hafnium, iron, magnesium, manganese, molybdenum, niobium, rhenium, tantalum, titanium, tungsten, and zirconium [15]. A broad range of superalloys has been evaluated for LMD including Alloy-625 [13,[16][17][18][19][20], Alloy-718 [6,[21][22][23][24][25][26][27][28][29][30][31], Alloy-738 [12,32], CMSX4 [33][34][35], Rene41 [36,37] and Waspaloy [10,38]. There are some parameters of particular importance to LMD, as listed in Table 1, to have a controlled deposition.…”

Section: Materials Characteristics and Process Parametersmentioning

confidence: 99%

“…Furthermore, the grain size fluctuation decreased with increased overlapping rate leading to a more uniform microstructure. • L. Fengcheng et al [24] investigated the influence of single direction raster (SDRS) and cross direction raster scanning (CDRS) as shown in Figure 7. Their result suggests that CDRS inhibits the columnar dendrite growth in the deposition direction which is characteristic for the SDRS.…”

Section: -^2 4 5 3 -^2 4 7 6 -H * Smentioning

confidence: 99%

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Review of Laser Deposited Superalloys Using Powder as an Additive

Segerstark¹,

Andersson²,

Svensson³

2014

8th International Symposium on Superalloy 718 and Derivatives (2014)

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In this paper laser metal deposition (LMD) with blown powder was reviewed with respect to the material behavior of nickel and nickel-iron based superalloys. The key benefits of LMD are claimed to be increased design freedom of components as well as reduced environmental impact since it enables near net shape manufacturing. This review considers the LMD processing parameters such as laser power, powder feed rate, spot size, standoff distance, and traverse speed, together with aspects related to the powder e.g. morphology, porosity, inclusion and satellite content. Special emphasis was put on how these parameters affect the deposit and substrate in terms of cracking, porosity, inclusions, phase transformations, and other material related phenomena. A characteristic microstructure of LMD deposited superalloys has a columnar dendrite growth in the vertical build up direction. The grain growth can however be manipulated, making it more equiaxed by, for instance, altering process parameters and/or scanning path. Residual stresses in LMD samples are unevenly distributed and large residual tensile stresses can be found at the surface of the deposit while large compressive stresses are located close to the substrate in the core of the deposit. One of the most important parameter is considered to be the specific energy input which largely influences the m elt pool during deposition which in turn can be related to the microstructure, residual stress and, process related defects such as porosity, cracking, lack of fusion and, dilution.

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“…Wang et al [1] found that a regular microstructure with good metallurgical bonding, minimal defects and fine dendritic grains is formed by SLM. Liu et al [6] investigated the microstructure of the SLM processed Inconel 718 samples, and it is found that the sample consists of the columnar dendrites grown epitaxially along the deposition direction. Amato et al [7] observed the microstructure of SLM Inconel 718 components using transmission electron microscopy (TEM), and the fabricated components exhibited a more pronounced [200] columnar γ" phase precipitate architecture parallel to the build direction (spaced at ~0.8 μηι).…”

Section: Introductionmentioning

confidence: 99%